CTS BD1N is a high-carbon nitrogen-enriched stainless steel produced by the American company Carpenter Technology Corporation.
It is an evolution of the older BD1 steel and has become a favorite "performance value" steel, particularly for those who value extreme sharpness and ease of maintenance.
Key Characteristics
Nitrogen-Enriched: The "N" stands for Nitrogen. By replacing some carbon with nitrogen, Carpenter increased the steel's hardness and corrosion resistance without making it brittle. It typically reaches a hardness of 57–60 HRC.
Laser Sharpness: Much like the Swedish Sandvik 14C28N, BD1N has a very fine grain structure. This allows it to take a wicked sharp, razor-like edge that is excellent for slicing.
Outstanding Corrosion Resistance: It is highly resistant to rust and staining, making it an excellent choice for kitchen knives or EDC knives used in humid environments.
High Toughness: It is not a "chippy" steel. It can handle everyday tasks and light impacts very well without the edge breaking.
Easy to Sharpen: Unlike the "super steels" we recently discussed (like S90V), BD1N is very easy to sharpen. You can get it back to hair-shaving sharpness with very little effort.
Chemical Composition
Carbon (C): 0.85% – 0.95% (Provides good hardness)
Chromium (Cr): 15.00% – 17.00% (High level for great rust resistance)
Nitrogen (N): 0.10% – 0.15% (The key addition for hardness and stability)
Manganese (Mn): 1.00%
Silicon (Si): 1.00%
Common Applications
Spyderco Knives: It is a signature steel for Spyderco’s lightweight models made in the USA (e.g., the Para 3 Lightweight and the Manix 2 Lightweight).
Kitchen Cutlery: Highly popular for mid-to-high-end chef knives because it is food-safe, rust-proof, and easy to keep sharp.
Everyday Carry (EDC): Ideal for people who want a high-performance knife that they can easily maintain themselves.
Comparison: CTS-BD1N vs. 14C28N
These two are the biggest rivals in the "high-performance budget" category:
CTS-BD1N generally offers slightly better edge retention and can be hardened a bit higher.
14C28N is generally considered to have slightly better toughness.